Closure for bottles containing oils and oil compounds



A. H. WARTH July 24, 1934.

CLOSURE FOR BOTTLES CONTAINING OILS AND OIL COMIOUNDS Filed March 20, 1931 Patented July 24, 1934 PATENT OFFICE oLosURE on BOTTLES CONTAINING OILS AND 011. COMPOUNDS Albin H. Warth, Baltimore, Md., assignor to Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York Application March 20, 1931, Serial No. 524,160

Claims.

.The present invention relates to bottle closures and particularly to such closures adapted for sealing bottles containing oils-and oil mixtures.

It has been a very diflicult matter to provide 5 a liner for closures for oil containing bottles, which will be odorless, tasteless and absolutely leak-proof.

If the liner is not'absolutely leak-proof when the bottle contents are subjected to heat, as in transportation, thevapors of the oil will leak out and condense on the outside of the container,

staining the paper label and spoilingthe saleability of the package.

It is well known that the sealing face or neck ring of a glass bottle is not perfectly smooth, but has numerous minute imperfections or irregularities of contour due to the contraction of the glass in cooling or to the use of imperfect neck ring molds in forming the bottle.

Two materials in particular have been heretofore employed as linings for caps for the purpose stated, one being a metal foil, commonly tin, of a substantial thickness, and the other cellophane.

A leak-proof seal cannot be provided by metal foil of a thickness that will permit it to be handled for pasting to a body of cushion material such, for example, as cork, corkcomposition, pulp or newsboard.

Therefore, it has been customary and necessary to coat the tinfoil with a resilient material such as gelatin, or apply to the exposed face of the foil a disc-like film of gelatin. Such film will conform to irregularities of the surface of the bottle finish and clearly improves the sealing qualities of the cap and closures of this character have been, and are now, used in large quantities.

Caps having linings provided with such gelatin film facings are not, however, entirely satisfactory because the gelatin film does not retain its original form under varying conditions of humidity. Such film is not water-proof and either swells or contracts under changing conditions of the weather and'furthermore, linings in. which a metal foil is provided with a gelatin film facing are relatively expensive.

While, as above noted, cellophane has been used as a facing for a cork or similar lining, it does not provide a good seal unless used as a loose insert between the cushion-like body of the lining and the glass wall of the bottle mouth, and then only when the lip of the bottle mouth has been moistened with a suitable adhesive.

Again, while cellophane, employed in the manner last described, will provide a good closure, it is rendered useless as a sealing means when once broken, and thereafter the cap is not effective As shown in the drawing, the liner comprises four plies or layers. 1 represents a thin sheet of foil, preferably aluminum, although other relatively stifi metal foils may be employed in some instances. The term relatively stiff metal foil, used in the claims, is meant to describe a foil made from a metal having a hardness no lower than aluminum or similar alloys, and distinguished from such soft metals as lead and tin. A layer of paper 2, is bonded by a suitable cement 3 to the layer of foil 1.

The combined paper and foil sheet is then coated on the exposed paper face with a substan-- tial thickness of gutta percha or more preferably has applied to such a face a layer 4 of gutta percha tissue.

The three ply material thus formed is then attached with the aid of heat, for softening the gutta percha, and pressure, to the body 5 of the lining which body. may be of cork, cork composition, pulp or newsboard.

The body 5 may be initially in the form of a ribbon or sheet and have a thickness of approximately 1/12" or 1/14".

The foil sheet 1 is preferably of a thickness approximating .0005", while for the paper layer 2 a thirty pound bond paper of approximately, .003" thickness has. been found very suitable.

If the gutta percha facing is applied in the form of a dough-like mass or coating, it preferably has a substantial thickness of approximately .002", while if gutta percha tissue is employed as the means for adhesively bonding the composi'te paper and foil strip or sheet to the body 5, such tissue need not exceed in thickness .0035.

The foil layer 1 must necessarily be very thin, but should not be thin enough to be substantially porous. Experiments have shown that the lower limit of suitable thickness of this layer should be approximately .00045".

The purpose of employing thevery thin foil is that it will take up the very slight imperfections or irregularities in the surface of the glass finish "and the paper layer 2 on which the foil is mounted facilitates the handling of the thin foil, preventing it from becoming wrinkled, which would render it useless. By making the gutta percha element of the lining of approximately the thickness described, I insure not only the desired adhesion between the foil and body 5, but such gutta percha layer also increases the resilient properties of the lining.

The improved lining has been found very satisfactory for caps for closing containers for oils and oil compounds such for example as mineral oils, cod liver oil and cod liver oil emulsions, and containers having caps provided with such a lining may be exposed to elevated temperatures such as 160 F. for a period of several hours without any leakage developing.

In the drawing, the improved lining is shown as arranged within a screw cap 6 of common form, but, of course, theinvention is not limited to any particular shape or design of cap.

As previously noted, the gutta percha layer atively stifi metal foil of such thinness that it will take up minute imperfections in the sealing lip of a receptacle, and beingof the order of .0005" in thickness, said foil being united by a thin layer of adhesive to a thin paper backing, a cushion body, and an adhesive layer of gutta percha between said paper backing and said .0005" in thickness, said foil being united by a thin layer of adhesive to a paper backing of substantially .003" in thickness, a cushion body, and an adhesive layer of gutta percha between said paper backing and said cushion body.

3. A liner for use with. closure caps of the screw or lug type, said liner comprising a facing of relatively stifi metal foil of such thinness that it will take up minute imperfections in the sealing lip of a receptacle, and being of the order of .0005" in thickness, said foil being united by a thin layer of adhesive to a paper backing of substantially .003 in thickness, a cushion body, and an adhesive layer of gutta percha between said paper backing and said cushion body, said gutta percha layer being relatively thick and ranging in the neighborhood of .002" to .0035.".

4. A liner for use with closure caps of the screw or lug type, said liner comprising a facing of relatively stiff metal foil of such thinness that it will take up minute imperfections in the sealing lip of a receptacle and being of the order of .0005", but no thinner than .00045", said foil being united by a thin layer of adhesive to a thin paper backing, a cushion body, and an adhesive layer of gutta percha of substantial thickness between said paper backing and said cushion 5. A liner for use with closure caps of the screw or-lug type and especially adapted for sealing oil containing receptacles without the application of unusually high sealing pressures, said liner comprising a facing of relatively stiff metal foil of abnormal thinness, of the order of .0005", said foil being united by a thin layer of adhesive to a thin paper backing, a cushion body, and a resilient adhesive layer of gutta percha between said paper backing and said cushion body, said gutta percha layer being relatively thick and ranging in the neighborhood of .002" to .0035", said resilient gutta percha layer and said thin paper layer serving to-permit said thin foil facing to bend or flow into and around minute imperfections on the sealing lip of the receptacle without the application of excessive pressures, whereby a hermetic seaLmay be formed with the sealing pressures normally applied by a screw or lug cap.

* ALBIN H. WARTH. 

